How Stress Affects Fertility

If you are trying for a baby, you have almost certainly been told to “just relax.” It is perhaps the most frustrating piece of advice given to anyone navigating their fertility journey. While well-meaning, it ignores the very real, biological connection between stress and your reproductive health.

It also ignores the vicious cycle it creates: worrying about fertility causes stress, and then you get stressed about being stressed.

This article explores the science of how stress can impact fertility in both men and women. It will also provide practical, actionable steps you can take to manage its effects, such as blood testing, and most importantly, regain a sense of control over your health.

What’s Really Going On?

Your body is hard-wired for survival. When it perceives a major threat, whether it’s a lion, a work deadline, or deep anxiety about getting pregnant, it triggers a “fight-or-flight” response. This response is run by your nervous system and a cocktail of hormones, mainly cortisol.

In short bursts, this system is brilliant. But when stress becomes chronic, your body stays in this high-alert state. It begins to believe that now is not a safe or sensible time to reproduce. It starts diverting resources away from your reproductive system to focus on “surviving” the perceived threat.

This is where the biological impact begins.

How Chronic Stress Affects Female Fertility

For women, the primary impact of stress is on ovulation. The hormonal system that regulates your menstrual cycle is incredibly sensitive to external influences.

It Can Disrupt Ovulation
The entire process is controlled by a delicate feedback loop between your brain (the hypothalamus and pituitary gland) and your ovaries. Chronic stress can disrupt the brain’s signals. This can lead to an irregular cycle, a delayed period, or in some cases, anovulation (a cycle where you don’t release an egg at all). If no egg is released, pregnancy cannot happen.

The “Pregnenolone Steal”
Your body uses a “mother hormone” called pregnenolone to make other hormones. Think of it as a crossroads: one path leads to cortisol (the stress hormone), and the other leads to progesterone. Progesterone is essential for fertility. It makes the uterine lining “sticky” and receptive for a fertilised egg and is vital for sustaining an early pregnancy.

When you are chronically stressed, your body demands huge amounts of cortisol. To meet this demand, it starts “stealing” the pregnenolone that should have been used to make progesterone. This can result in low progesterone, even if you do ovulate, making it harder for an embryo to implant successfully.

It Can Mimic Other Conditions
The symptoms of chronic stress (fatigue, irregular cycles, anxiety, low mood) are often vague. They can also be symptoms of an underlying hormonal imbalance, such as a thyroid disorder or Polycystic Ovary Syndrome (PCOS). This is why “just stress” can be a confusing diagnosis.

Our female fertility blood test checks important hormones related to fertility, giving you the objective data needed to screen for potential problems stopping you from conceiving.

Does Stress Affect Male Fertility Too?

Fertility is a team effort, and stress significantly impacts male reproductive health. While often overlooked, this is an important piece of the puzzle.

• Impact on Testosterone

  Similar to women, chronic stress can disrupt the hormonal signals from the brain. This can interfere with testosterone production, a hormone essential for libido and sperm production.

• Impact on Sperm

  Studies show that men experiencing high levels of stress may have lower sperm concentration, reduced sperm motility (how well they swim), and a higher number of abnormally-shaped sperm.

• Oxidative Stress

  Psychological stress can increase "oxidative stress" throughout the body. This is a state of imbalance that can damage cells, including the DNA within sperm. Damaged sperm DNA can be a factor in infertility and miscarriage.

If you are struggling to conceive, it is vital that both partners consider how stress and other factors are impacting their health. A male hormone blood test can provide valuable insights into testosterone levels and other key health markers.

The IVF and Fertility Treatment Cycle

For many couples, the fertility journey itself is the single greatest source of stress. The endless appointments, the waiting, and the emotional and financial pressure of treatments like IVF can be overwhelming.

It’s a cruel paradox. Research on whether stress directly impacts IVF success rates is mixed. However, there is no question that high stress levels make the process itself infinitely harder to endure. High stress can lead to poorer mental health, which may cause some people to stop treatment early.

This is why most fertility clinics now have integrated support, such as counsellors, to help you manage the emotional side of treatment.

What About Stress During Pregnancy?

The worry doesn’t always stop once you have a positive test. Many women feel anxious about work-related stress, emotional stress, and its potential effect on their baby.

It is important to say that everyday stress, a tough day at work, an argument, or feeling overwhelmed, is a normal part of life and is very unlikely to harm your baby. Your body is incredibly well-designed to protect a developing pregnancy.

However, the key is to manage chronic or severe stress. Research shows that very high levels of prolonged stress (such as from trauma, bereavement, or a severe anxiety disorder) can be linked to a higher risk of pre-term birth or low birth weight.

The concern, as with fertility, is hormones. High, persistent levels of cortisol can cross the placenta. This is why managing your mental well-being is just as important as your physical health during pregnancy.

If you are experiencing stress, insomnia, or anxiety that feels unmanageable, it is vital to speak to your midwife or GP. They are there to support you and can refer you to perinatal mental health services.

Practical Steps to Manage Stress from Dr Thom Philips

You cannot eliminate stress. But you can change how your body responds to it. The goal is to send your body a “safety” signal, telling it that it’s okay to prioritise reproduction.

• Focus on "Good Enough" Sleep

  Stop chasing the perfect eight hours, as this can create more anxiety. Instead, focus on a consistent routine. Try to go to bed and wake up at roughly the same time. Good sleep is the single best way to regulate your hormones, including cortisol.

• Move Your Body

  Intense, punishing exercise can act as another stressor on the body. Instead, focus on moderate movement: a brisk walk, a gentle jog, swimming, or yoga. This type of exercise helps to lower cortisol and improve insulin sensitivity, both of which are great for fertility.

• Eat for Hormone Balance

  Your body needs fuel to make hormones. Focus on a balanced diet with three clear goals; Protein at every meal to help build hormones; Healthy Fats (avocado, nuts, seeds, olive oil) as they are the building blocks of your sex hormones; Fibre & Complex Carbs (vegetables, whole grains) to keep your blood sugar stable and avoid energy crashes.

• Breathe

  When you are anxious, your breathing becomes short and shallow. This tells your brain you are in danger. You can interrupt this cycle by taking slow, deliberate breaths. Try the "4-7-8" technique: inhale for 4 seconds, hold for 7, and exhale slowly for 8. Do this three times. It's a physiological "off-switch" for the panic response.

• Talk to Someone

  Find a person you can be completely honest with, such as your partner, a friend, or a professional therapist. Voicing your fears can take away their power.

Dr Thom Philips answers commonly asked questions about stress and fertility